Log-dislodging air-gun



W. B. MAHERN AND H. G. GOSSELIN.

LOG DISLODGING MB GUN.

APPLICATION FILED MAY29. 1920.

Patented Jan. 25, 1921.

2 SHEETSSHEET 1.

INVENTORS WIY/I'am 5. Nahe'r'n ATTORNEY W- B- MAHERN AND H. G. GOSSELIN.

LOG DISLODGiNG MR GUN.

APPLICATION FILED MAY 29, 1920.

UNITED stares PATENT QFFICE.

WILLIAM as. MAI-IERN AND HENRY G. G'GSSELIN, or BERLIN, new HAMEHIRE,

LOG-.DISL'ODGING AIR GUN.

Specification of Letters Patent. Pate t d J 25 192 .Applicationfilea May 29. 1920. Serial No. 385,219.

1 0 all whom-it may concern .i I

Be it known that we, WILLIAM B. MA- IIERN and HENRY G. GossnLIN, citizens of the United States, residihg at Berlin, in the county of Coos and State of New Hampshire, have invented a new and useful Log- Dislodging Air-Gun, of which the following is a specification.

Our invention hasfor its purpose to provide an improved means that is especially designed to be .used for dislodging' hulp wood in logging communities and where the wood accumulates in such large piles, frequently containing as much as fifty or sixty thousand cords, whichwhen it becomes necessary to handle the wood for pulp mill uses, is dislodged and removed with considerable diiiiculty pulling the piles down, after large amounts have been removed from the base of the accumulation and necessitating the use ofenplosivesunder great danger of' pers onal injury to those using the same. i p I Primarily, our invention has for its object to provide a simple, inexpensive and easily manipulated means, in the nature'of an air gun, that can be, with absolute safety.

and w'itlimuohv efficiency, so utilized that when a large quantity ol the wood projects at anclevation toohig-h to be reached by ordinary means, a projectile heavy log of wood) can be shot at thetower of wood, under sufficient force, to make it ffllli'ilIlCh with perfect safety to employees.

Our invention. comprehends .an air gun that. embodies the peculiar features of con- 7 struction and novel combination of parts,

all of which will be fully explained in the following description, specifically pointed out. in the appended claims and illustrated in the accompanying drawings, in which Fi ure 1 isia lon itudinal section of our construction of air gun, the parts being shown with the projectile ejecting means at the distended or normal position. 1

Fig. '2 a similar view, the piston shifted grabbing dogs being positionedforward in engagement, with the compression spring pull back knob. A

Fig. 3 is a-deta-il section illustrating the parts in position for the insertion of the load. y I Fig is a horizontal section on th-eline 4-4; on Fig- -1.

Fig, 5 is a transversese'ction takenon the Fig. 6 is a detail cross section on the line 6-6 on Fig. 1.

In the practical development of our invention, the same embodies, essentially, a barrel 1 into the outer open end of which is inserted the projectile to be ejected, in practice,a wooden log of suitable diameter and length, an ejecting member 16 on the end of a compressionspring 2 that is located within the barrel 1, and a shifting mechanism operable within the said barrel, under fluid impelled piston action, for placing the spring under tension, a "device being also included for releasing the spring, when under tension, at predetermined times, whereby, as the said spring expands, the projectile is ejected.

A grab device, presently more fully explained, that. is also-fluid controlled in its movement, is provided for pulling back the said spring to place it under tension;

AS'lS clearly shown in the drawings, the

barrel 1 is located in line with afworking cylinder 3, which latter and the barrel 1 are go nedwrtha centrally disposed connectmg sleeve 4, the opposite ends of which are internally threaded tor receiving the externallythreaded ends 10 and 30 of the barrel 1 and the cylinder 3.

The sleeve 4: referred to, isro'ckably supported on its trunnions 81-31 in a turn -table bracket 5 swivelly secured upon a suit able base 6, as shown. v

.edas in Fig. 2, it leads the air" through the pipe section 9 into the rear end of the piston head 11 (sec arrows a), the-air in front of the said head 11, during such adjustment, exhausting through the pipe 32 into the pipe section 90, through the valve 8 to arms-,7

phere. 3, I I

designates the outer or' cap head for the cylinder 3, and 34 indicates the forward or inner cylinder, head, the said head 3 being centrally apertured and carries a bearing gland 35, the latter with the head 3d constituting a guide through which the piston 12 passes, the said rod being also guided in and passes through a starting stem sleeve 13that moves in a steel disk 14, which curved inwardly for riding over V ping into lnterlocked engagement wlth the conical-knob 17, when the PlStOIl rod 12 1s is fixedly held in the adjacent threaded end of the center connecting sleeve 1 and to barrel 1, as is clearly shown in Figs. land- -2, by reference towhich it will be alsoseen that the starting sleeve 13 has a tapered forv ward end 13 the purpose of which will presently appear, and the said sleeve extends some distance within the 'inneror stationarily held end of the aforesaid tension spring i v 16 designates what is hereinafter termed a plunger disk and the said disk snugly fits the bore'of the barrel 1 andis welded or otherwise made fast to the forward end oi the coil tensionspringQ'and, at the inner side, the said plunger disk has a conica knob 17 formed with aloclring shoulder 17 for cooperating with a grab-device that is carried on the forward end of the piston 12.

'The grab device consists 01": two clamping I jaws or dogs 18-1S and, they are pivotally olned, scissors :l1lr'e,to the piston rod 12 and the outer or grab ends of the seal dog 5 a1 moved "forward, as will be presently ex plained. v 7

The grabbing ends of the j aws' 1'8 18 are normally held closed by a retractile spring 19 and the l rearwardly 189-18 of the dogs are .divergingly extended for receiving the-beveled head 13" of the starting sleeve betweenthem, during the operation of effecting the release of the grab device from the plunger disk. I

To avold the cushionlng'of a-1r within the barrel "1, during'the operation of pulling back'or storing tension 111;; the. spring 2 the: slotted as at l (see Figs. 1,"

said barrel is 2 and 5). 4 1

At the rear" ends, thestarting sleeve 13 has an annular groove 18 into whlch pro ects a stud 20 on a starting lever 20 that exten (ls through and is laterally shiftablc in a slot 4-0 in the top ofthe connecting sleeve 4.

The lever 20 is pivoted at its lower end on the inside of the bottom of the sleeve 4 and, in practice, the said lever has sufficient swing to slide the sleeve 13 along the piston" rod for effecting the releaseoit the'grab' device before mentioned; From the foregoing description taken in connection with the drawings, the complete construction, the mannerof its operation and the advantages of our invention will be To operate the gun, assuming the parts to working 1 and snapextended ends 1 causes the dogs 18bit the grab device to engage and interlod: with the knob 17', the resiliency of the spring 2 taking up any undue shocks. I V

By proper adjustment of the valve v8, the

laid is caused to 'go into the opposite end of the cylinder 1, which will force the piston 11 back and thereby compress the spring untilthe diverged arms or the dogs 18 reach over the tapered endlil of the starting sleeve 13 (see Fig. 8),.

The projectile. (log) is theninscrtedinto V rection of the "arrow 0 Fig. 3, causing the the barrel with the inner end' abutting the starting sleeve to disengage the grab dogs I 18 from the knob '17, thereby freeing the for which'the'gun has becnadjusted.

While the general arrangement of the stored up spring 15, and causing the gun to discharge the'pro ectdein the direction parts, as shown in the drawings, illustrates a'prefer'red and practical construction, it is understood that the details shown and described may be readily modified onvaried without, departing-from our invention as comes {within the" scope "of the appended clairnsf 1 J fVVhat we claim is: 1-75:

A 1 In an apparatus of'theclass; described, a centrally disposed sleeve-like body, a bar- "rel projected from ,one end of the sleeve, a piston; contained cylinder projected from the other end of the said'sleeve-likebody; the cylinder and its piston being in longitudinal alinement with the barrel, fluid pressure 'means connected with-xthe' cylinder and adapted, under proper adjustment, "for .re 'ciprocably. actuating the piston, a coil spring, a projecting element that engages "the outer end oithe spring, and a device connected to and movable withthe piston, thesaid device including'a grapple that en- W gagesand connects with the projecting ele- 1 ment on the outer end .of the spr ng, as the device moves outwardly under piston action and as the springexpands, and whichis also adapted, under piston action, tofpull' the said-ejector and the coil spring b'ac'k,' :whereby tol place' the spring under tension, and means for releasing the grapple.ifrorn" the ejector, whereby to free the-ispringimder tension and permit it to impel the ejector.

2. In'an apparatus of the class described, a body sleeve, a barrelextended from one side of the sleeve, a coil spring and a projecting member-cooperating with the spring and mounted within the barrehanda fluid pressure operated device including a 'gripwhen it is carried under fluid pressure to its outermost position, and lever controlled means for effecting the release of the grip ping member, when the spring and the ejec tor are at their innermost adjustment, and

held under tension, whereby to permit the forward projection of the spring and its coengaging projector element.

3. In a device of the class described, a barrel, a projection spring anchored at one end in the barrel, a head at the free end of the spring, a fluid pressure operated grapple device to grasp said head and draw back the spring, and means for releasing the grip of said grapple, said last named means comprising a lever controlled member slidable along the grapple device and adapted to release the grip of said grapple device, when moved into engagement with the same.

4. In an apparatus of the class described, a barrel, a projection spring in the barrel, a cylinder and piston, a piston rod connected to the piston and projecting into the barrel, a grapple on the rod, a member at the outer end of the spring adapted to be grasped by the grapple, fluid pressure means for moving said piston to project and retract the rod to thereby cause said grapple to grasp the spring member and compress the spring, and lever controlled means slidable along the rod to release the said grapple, when it is desired to free the said spring, when held under tension.

5. In an apparatus of the class described, a barrel, a projection spring in the barrel, a cylinder and piston, a piston rod connected to the piston and projecting into the barrel, a grapple on the rod, a member at the outer end of the spring adapted to be grasped by the grapple, fluid pressure means for moving said piston to project and retract the rod to thereby cause said grapple to grasp the spring member and compress the spring and means to release the said grapple, when it is desired to release said spring, said last named means comprising a sliding cone and said grapple comprising levers and a spring to hold said levers to the grasping position, and means for sliding the said conebetween said levers to release the same.

WILLIAM B. MAHERN. HENRY Gr. GOSSELIN. 

